package com.itheima.reggie.filter;

import cn.hutool.core.text.AntPathMatcher;
import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.Result;
import com.itheima.reggie.utils.BaseContext;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;

        //filterChain.doFilter(request,response);
        //本次请求url
        String requestUrl=request.getRequestURI();
        log.info("拦截到请求：{}",requestUrl);

        //        定义不需要处理的请求路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //        2、判断本次请求是否需要处理
        Boolean cheakUrl = checkUrl(urls, requestUrl);
        if(cheakUrl){
            //log.info("匹配到了：{}",requestUrl);
            filterChain.doFilter(request,response);
            return;
        }

        if(request.getSession().getAttribute("employee")!=null){
            //log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            long id = Thread.currentThread().getId() ;
            //log.info("线程id:{}" ,id);

            Long empId= (Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //        4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId= (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(Result.error("NOTLOGIN")));



        return;
    }

    public boolean checkUrl(String[] urls,String requestUrl){
        Boolean matchUrlResult = true;
        for (String currUrl : urls) {
            matchUrlResult=PATH_MATCHER.match(currUrl,requestUrl);
            if(matchUrlResult){
                return true; //放行
            }
        }
        return false;
    }
}
